Preferred Label : Mucopolysaccharidosis, type iiic;
Symbol : MPS3C;
CISMeF acronym : MPS3C;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Mps iiic; Sanfilippo syndrome C; Acetyl-coa:alpha-glucosaminide n-acetyltransferase deficiency;
Description : Sanfilippo syndrome comprises several forms of lysosomal storage diseases due to impaired
degradation of heparan sulfate. The deficient enzyme in Sanfilippo syndrome C, or
MPS IIIC, is an acetyltransferase that catalyzes the conversion of alpha-glucosaminide
residues to N-acetylglucosaminide in the presence of acetyl-CoA. For a general phenotypic
description and a discussion of genetic heterogeneity of Sanfilippo syndrome, see
MPS IIIA (252900).;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the heparan-alpha-glucosaminide N-acetyltransferase gene (HGSNAT,
610453.0001);
Laboratory abnormalities : Acetyl CoA:alpha-glucosaminidase N-acetyltransferase deficiency in fibroblasts; Heparan sulfate excretion in urine; Metachromasia of white blood cells and fibroblasts; Enzyme replacement therapy has not been effective;